A rod of brass la held in hand and rubbed with fur. The rod is found to have
no charge
positive charge
negative charge
can't be said
Correct Answer :
A. no charge
Related Questions
The speed of sound in a medium depends upon the properties of the medium such as
its density
its temperature
its elasticity
All the above
The principle of equivalence of mass and energy was established by
Dalton
Rutherford
Einstein
Planck
Mercury is used in a barometer because
its density being very high 13.6 g/cm3 the height of mercury column is conveniently small
at the ordinary temperature its vapour pressure is small
it is opaque and does not wet glass
All the above
The device for tracking and locating the position of a moving object in space is called
Space ship
Lunar module
Radar
Rocket
Resistance is measured in
Volts
Amperes
ohms
coulombs
Which force is used when milk is churned to separate cream?
cohesive
centrifugal
frictional
gravitational
A pair of stars that revolve round each other is
a neutron star
a binary star
a dwarf star
a polar star
The acoustical quality of a room depends on
the size and shape of the room
the ability of the ceiling, walls and floor to exclude unwanted sound
the use of furnishings made of sound absorbing materials
All the above
Two tumblers stuck together can be separated by
pouring ice cold water into the inner tumbler
pouring ice cold water on the outer tumbler
pouring hot water into the inner tumbler
dipping both the tumblers in hot water
When a ship floats on water, the weight or water displaced is
an indeterminate quantity
equal to the weight of the ship
greater than the weight of the ship
less than the weight of the ship
A cyclist leans inwards when he is negotiating a curve 10 that
he may increase his speed
his weight may be reduced
necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion
no frictional force may be produced between the wheels and the axle
We see the sun before it actually rises on the horizon. This is due to
refraction
reflection
total internal reflection
parallax
When an incident beam of light strikes the surface of a glass slab normally, the refracted beam
goes straight through without bending
gets deviated away from the normal
gets bent towards the normal
gets reflected
In the visible spectrum which colour has the shortest wavelength?
Red
Blue
Yellow
Violet
When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy in the form of electromagnetic wave pulses called
neutrons
electrons
phonons
photons
Electromagnets are used in
the telephone ear piece
the telegraph
the electric bell
All the above
Out of the following which element has the longest half-life period?
Radium
Radon
Uranium-238
Plutonium
The maximum range of most TV signals is from 121 to 240 km only because
the curvature of earth limits the range of reception
the signals are weak
the signals are absorbed by air
the antennae are not powerful enough
The best estimates of the age of the earth comes from the studies of
angle of inclination of the earth
changes in radio-active minerals in it
period taken by Sun's light to reach the earth
artificial satellites revolving round the earth
The attraction of unlike molecules at the common surface is known as
adhesion
cohesion
surface tension
capillarity
At temperature near OK, (zero kelvin) metals such as lead and tin become
insulators
semiconductors
superconductors
condenser
No current will flow between two charged bodies if they have the same
resistance
charge
potential
charge/potential ratio
In compact porous soil, the rising of the water is due to
capillarity
cohesion
adhesion
viscosity
The brightest planet in the Solar System is
Jupiter
Mercury
Venus
Sirius
An integrated circuit is more advantageous than a conventional circuit because
they make the electric equipment more reliable and easier for servicing
a faulty part of a conventional circuit may be difficult to locate and repair
if a part of the integrated circuit fails the entire circuit is simply replaced
All the above
The Milky Way is
the path of a star which is nearest to the earth
a galaxy which includes the sun
a star that is nearest to the earth
None of these
Sun spots are
the mountains found on the surface of the Sun
the dark patches on the sun having less temperature than the normal sun's surface
ionized gas found near the solar surface
the magnetic storms on the surface of the Sun
The phenomenon of spontaneous disintegration of certain heavy nuclei is termed
radioactivity
fission
fusion
implosion
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meteors
binaries
variable stars
bright stars
What la the minimum velocity required for a rocket to overcome earth's gravity and travel into space?
18 km/sec
11.2 km/ sec
21 km/ sec
35 km/ sec